Fibroblast growth factor 21 (FGF21 for short) was a hot prospect in anti-obesity research — and drug companies jumped into the fray, eager to capitalize. But now it appears that, like sticks and stones, FGF21 will break your bones. Here's the story of the hip new weight-loss drug that may never see the light of day. »2/08/12 7:05pm 2/08/12 7:05pm